Supplement S2 Prediction of three crane species with different predictor groups 1

2 For Hooded Cranes, RF21 and RF29VARC are the best, RF21 a little bit better than RF29VARC. PCA and Factor Analysis(FA) are bad 3

1 For White-naped Cranes, RF21 was in the first level group, PCA and Factor Analysis(FA) are bad. 2

3

1 For Black-necked Cranes, RF21 was in the first level group, PCA and Factor Analysis (FA) are bad 2

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